- synchronized is a modifier applicable for methods and blocks but not for classes and variables.
- If multiple threads are trying to operate simultaneously on the same java object then, there may be a chance of data inconsistency problem.This is called "Race Condition".We can overcome this problem by using synchronized keyword or modifier.
- If a method or block declared as synchronized then at a time only one thread is allowed to execute that method or block on the given objects so that data inconsistency problem won't come.
- But the main disadvantage of "synchronized" modifier is, it increasing waiting time of the threads & creates performance problems.hence if there is no specific requirement then it is not recommended to use synchronized keyword.
- synchronized method compulsory contain implementation whereas abstract method doesn't contain any implementation hence "abstract synchronized" is an illegal combination of methods.
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